Detachable hub for eccentrics



May1,'1923.

,1. M. STONE DETACHABLE HUB FOR ECQENTRICS Filed April 17 1922 J. M. STONE.

Patented May 1, 1923.

JOHN M. STONE, OF CARRIZO SPRINGS, TEXAS;

DETACHABLE HUB r03 noonn'rnros.

Application filed April 17, 1922. Serial No. 553,316.

and State of Texas, have invented certain new and useful Improvements in Detachable Hubs for Eccentrics, of which the following is a full, clear, and exact description.

My invention relates to pump jacks and the like, and has for its object to provide in connection with the shaft thereof a sleeve or sleeves provided with flanges for strengthening purposes and also for the purpose of'attachment to an eccentric and to the driving gear.

Another object of the invention is the provision of an adjustable eccentric whereby its throw may be varied and likewise the stroke of the pump rod.

Other objects and advantages of the invention will be apparent from the following description when taken in connection with the accompanying drawing, in which:

Figure 1 is an elevation of the eccentric and detachable hubs, parts being broken awa Figure 2 is a section taken on line 22 of Figure 1, looking in the direction of the arrow.

Figure 3 is a section taken of Figure 2.

Figure 4: is a horizontal section taken on line 44 of Figure 2, and

on line Figure 5 is a fragmentary perspective view of the pump jack.

Referring to the drawing more in detail, the numeral 1 designates the frame of a pump jack on which is rotatably mounted a shaft 2. An eccentric 3 is mounted on the shaft 2 and is provided with a slot 4 in order that the same may be adjusted to vary the throw of the eccentric and the movement of the pump rod 5.

Tightly fitted to the shaft 2 at each side of the eccentric 3 are sleeves 6 and 7. These sleeves are locked against movement by means of the set-screws 8. Each of the sleeves 6 and 7 is provided with a flange 9 at its innerend and a flange 10 at its outer end. The flange 10 at the right of Figure 1 is provided with bolt holes 11, by means UNI ED? stares Parent ops-m5) of which the same may be bolted to a gear wheel, pulley or the like 12. j 7 On each face of the eccentric 3 is a pair of guide and strengthening members 13, be-

tween which the flanges 9 are positioned.

Each face of the eccentric is further provided with a series of bolt holes 14 adapted to receive bolts 15 which also extend through apertures in the flanges 9, thereby securely locking the flanges to the eccentric 3.

The eccentric strap is formed of two semicircular sections 16 which are bolted together and to. the pitman 18 by means of the laterally extending flanges 17. The coacting faces of the eccentric 3 and strap 16 tween the guide bars 13. j The bars 13 not only act s guides for the flanges 9, but

nection between flanges and eccentric. Furthermore, the flanges 9 and 10 form a reinforcing means for the sleeves 6 and 7 By means of the foregoing construction it will be seen that I have provided very simple means by which the throwof the eccentric may be varied, and also means for detachably connecting the driving gear to the eccentric.

In accordance with the patent statutes, I have described what I now believe to be the best embodiment of the invention, but I do not wish to be understood thereby as limiting myself or the scope of the invention, as many changes and modifications may be made without departing from the spirit of the invention; all such I aim to include in the scope of the appended claims.

What I claim as new and desire to secure by Letters Patent is:

1. A pump ack also form a reinforcing means for the con- 'ncluding a shaft, a v

slotted eccentric on said shaft, a plurality slotted eccentric on said shaft, ribs on 0pof sleeves locked to said shaft on opposite posite faces of said eccentric, a plurality 10 sides of the eccentric, flanges 0n the 0pof sleeves on said shaft, flanges 0n the ends posite ends of said sleeves, certain of the of said sleeves, certain of the flanges being 6 flanges being adjustably connected to the positioned between the ribs and adjustably eccentric, and a driving Wheel secured to ,anconnected to the eccentric. other of the flanges.

2. A vpump jack including a shaft, a JOHN M. STONE. 

